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Titolo:
Temporal frequency of whisker movement. II. Laminar organization of cortical representations
Autore:
Ahissar, E; Sosnik, R; Bagdasarian, K; Haidarliu, S;
Indirizzi:
Weizmann Inst Sci, Dept Neurobiol, IL-76100 Rehovot, Israel Weizmann Inst Sci Rehovot Israel IL-76100 biol, IL-76100 Rehovot, Israel
Titolo Testata:
JOURNAL OF NEUROPHYSIOLOGY
fascicolo: 1, volume: 86, anno: 2001,
pagine: 354 - 367
SICI:
0022-3077(200107)86:1<354:TFOWMI>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
RAT BARREL CORTEX; POSTERIOR MEDIAL NUCLEUS; PRIMARY SOMATOSENSORY CORTEX; SOMATIC SENSORY RESPONSES; SHORT-TERM PLASTICITY; VENTRAL POSTERIOR; THALAMOCORTICAL PATHWAY; SYNAPTIC ORGANIZATION; CELLULAR MECHANISMS; RECEPTIVE-FIELDS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
54
Recensione:
Indirizzi per estratti:
Indirizzo: Ahissar, E Weizmann Inst Sci, Dept Neurobiol, IL-76100 Rehovot, Israel Weizmann Inst Sci Rehovot Israel IL-76100 100 Rehovot, Israel
Citazione:
E. Ahissar et al., "Temporal frequency of whisker movement. II. Laminar organization of cortical representations", J NEUROPHYS, 86(1), 2001, pp. 354-367

Abstract

Part of the information obtained by rodent whiskers is carried by the frequency of their movement. In the thalamus of anesthetized rats, the whisker frequency is represented by two different coding schemes: by amplitude and spike count (i.e., response amplitudes and spike counts decrease as a function of frequency) in the lemniscal thalamus and by latency and spike count (latencies increase and spike counts decrease as a function of frequency) in the paralemniscal thalamus (see accompanying paper). Here we investigatedneuronal representations of the whisker frequency in the primary somatosensory ("barrel") cortex of the anesthetized rat, which receives its input from both the lemniscal and paralemniscal thalamic nuclei. Single and multi-units were recorded from layers 2/3, 4 (barrels only), 5a, and 5b during vibrissal stimulation. Typically, the input frequency was represented by amplitude and spike count in the barrels of layer 4 and in layer 5b (the "lemniscal layers") and by latency and spike count in layer 5a (the "paralemniscallayer"). Neurons of layer 2/3 displayed a mixture of the two coding schemes. When the pulse width of the stimulus was reduced from 50 to 20 ms, the latency coding in layers 5a and 2/3 was dramatically reduced, while the spike-count coding was not affected; in contrast, in layers 4 and 5b, the latencies remained constant, but the spike counts were reduced with 20-ms stimuli. The same effects were found in the paralemniscal and lemniscal thalamic nuclei, respectively (see accompanying paper). These results are consistentwith the idea that thalamocortical loops of different pathways, although terminating within the same cortical columns, perform different computationsin parallel. Furthermore, the mixture of coding schemes in layer 2/3 mightreflect an integration of lemniscal and paralemniscal outputs.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/12/20 alle ore 09:42:40